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Science → MCQs → Physics → Physics questions from 16 to 20

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16. The melting point of ice is lowered by a/an __________ in pressure.
(A) increase
(B) decrease
(C) change
(D) consistency

17. At high altitude the air temperature is lower as compare to sea level, therefore water boils at __________ temperature.
(A) lower
(B) higher
(C) constant
(D) absolute

18. Evaporation is a __________ process.
(A) condensation
(B) Liquefying
(C) cooling
(D) convection

19. The refrigerator works on the two processes
(A) condensation and convection
(B) convection and radiation
(C) radiation and evaporation
(D) condensation and evaporation

20. Air is a very good __________ of heat.
(A) conductor
(B) insulator
(C) radiator
(D) evaporator

ANSWERS: PHYSICS QUESTIONS
16. (A) increase
17. (A) lower
18. (C) cooling
19. (D) condensation and evaporation
20. (B) insulator